我县从1990年开始就把棉田覆盖麦秸作为一项保苗、肥田、增产的技术措施大面积推广。四年来全县已累计推广25.6万亩,平均亩增产皮棉8.2公斤,亩净增收30—35元。 从四年来的试验及大面积结果看,麦秸覆盖棉田有以下四个方面的作用: 1.调温控湿、防早衰。棉花虽是喜温作物,但温度过高也会抑制棉花的生长与发育。当气温超过36℃时,由于体内代谢消耗过多,造成养分供应不足,而引起蕾、花、铃的大量脱落。特别是地膜棉田,进入花铃期,膜内温度偏高,胁迫棉株根系的正常生长,致使根系发育不良,加上前期生长快,养分消耗多,导致后期早衰来的早且严重。采用麦秸覆盖棉田,对降温有明显的效果,一般较对照降低4—5℃,有利根系的发育和养分的吸收。棉 Since 1990, our county started to popularize wheat straw as a seedling, fertilizer field and technical measures to increase production. In the past four years, the county has promoted a total of 256,000 mu of land, with an average mu yield of 8.2 kg of lint and a net increase of 30-35 mu of mu. From four years of experiments and large area results, wheat straw covered cotton has the following four aspects: 1 temperature control wet, anti premature senility. Although cotton is a thermophilic crop, but the temperature is too high will inhibit the growth and development of cotton. When the temperature exceeds 36 ℃, due to excessive metabolism of the body, resulting in insufficient supply of nutrients, causing a large number of buds, flowers, bells off. In particular, cotton field, into the flowering period, the membrane temperature is high, stress the normal growth of cotton plant roots, resulting in poor root growth, coupled with rapid growth in the early, nutrient consumption, leading to the early and severe premature senility. Wheat straw covered cotton fields, the cooling effect has obvious, generally lower than the control 4-5 ℃, favorable root development and nutrient absorption. cotton